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Re:Alan Kay: Smalltalk is not about objects, it’s about mess... by abecedarius on Saturday December 21, 2019 @03:53PM (#21853303)
Hewitt created actors after hearing an early Smalltalk talk by Kay at MIT, as I recall it. That wasn't the only influence (capabilities were a big one, for instance) and I'd be surprised if there wasn't reciprocal influence, though.

In Hewitt's actor model, messages are also (immutable) actors. At least in the early version I read about.

Re:Alan Kay: Smalltalk is not about objects, it’s about mess... by ProfHewitt on Saturday December 21, 2019 @08:05PM (#21854415)
Actors were developed to unify and overcome limitations of

previous important contributions including lambda calculus

[Church 1932] (first-class procedures), Petri nets [Petri

1962] (true concurrency), semaphores [Dijkstra 1962-1963],

packet switching [Baran 1964] (concurrent communication

between computers using fixed size packets), capabilities

[Dennis and van Horn 1966] (pointer security), Simula [Dahl

and Nygaard 1967] (class hierarchy), and SmallTalk-72

[Goldberg and Kay 1976] (bit-mapped computer graphics and

browser, the precursor of modern programming Integrated

Development Environments). The lambda calculus could not

express concurrency with the consequence that lambda

calculus programs can be thousands of times slower than

Actors. A Petri net cannot dynamically expand and has the

limitation that tokens can miraculously disappear from

different places, which is inefficient to implement.

Capabilities have the limitation that pointers must be

manipulated using indexes into capability lists thereby

making programming awkward. Simula did not implement

concurrency and did not have messages. SmallTalk-72 used a

byte stream of program tokens thereby making it awkward for

concurrency.

See the following for more information: https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3418003

Re:Alan Kay: Smalltalk is not about objects, it’s about mess... by agumonkey on Sunday December 22, 2019 @05:52AM (#21856434)
another cyclical influence is scheme trying to reimplement the actor model in a lisp/lambda clothing.
Re:Alan Kay: Smalltalk is not about objects, it’s about mess... by ProfHewitt on Sunday December 22, 2019 @09:59AM (#21857418)
The programming language Scheme was originally named Schemer against Actors ;-)

The monad (https://wiki.haskell.org/Monad) is another mostly unsuccessful lambda calculus way to try to address some of the issues resolved in the Actor Model.

Re:Alan Kay: Smalltalk is not about objects, it’s about mess... by agumonkey on Sunday December 22, 2019 @02:32PM (#21859117)
My english is failing me, what's the meaning behind 'schemers against actors' ?

I only knew about actors for its scheme influence and the fact that it was highly concurrent (even this I'm not so sure). I got into college way too late for it to be studied sadly.

Re:Alan Kay: Smalltalk is not about objects, it’s about mess... by ProfHewitt on Sunday December 22, 2019 @05:12PM (#21860003)
The original name of the programming language Scheme was "Schemer", which was shortened by removing the last character because of file system limitations. The motivation for the name Schemer was that the authors were scheming against Actors analogous to the programming Conniver, where the authors were conniving against Planner.
Re:Alan Kay: Smalltalk is not about objects, it’s about mess... by agumonkey on Sunday December 22, 2019 @05:31PM (#21860090)
Oh I see the trail goes deep. Interesting.